Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C11/00—Aliphatic unsaturated hydrocarbons
  • C07C11/02—Alkenes
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
  • C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
  • C07C5/2206—Catalytic processes not covered by C07C5/23 - C07C5/31
  • C07C5/2266—Catalytic processes not covered by C07C5/23 - C07C5/31 with hydrides or organic compounds
  • C07C5/228—Catalytic processes not covered by C07C5/23 - C07C5/31 with hydrides or organic compounds containing metal-to-carbon bond; Metal hydrides
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
  • C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
  • C07C5/23—Rearrangement of carbon-to-carbon unsaturated bonds
  • C07C5/25—Migration of carbon-to-carbon double bonds
  • C07C5/2506—Catalytic processes
  • C07C5/2562—Catalytic processes with hydrides or organic compounds
  • C07C5/2575—Catalytic processes with hydrides or organic compounds containing metal-to-carbon bond; Metal hydrides
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2531/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • C07C2531/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2531/00—Catalysts comprising hydrides, coordination complexes or organic compounds
  • C07C2531/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
  • C07C2531/12—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides
  • C07C2531/14—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing organo-metallic compounds or metal hydrides of aluminium or boron
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/50—Improvements relating to the production of bulk chemicals
  • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Definitions

• the present invention relates to a process for isomerization of olefins, particularly to isomerization of double bonds. More particularly, it relates to a process for isomerization of olefin dimers comprising dimerizing a lower ⁇ -olefin such as ethylene, propylene or butene-1 with a Ziegler type catalyst comprising a nickel compound and an organo-aluminum compound as main components, and then continuing the reaction with addition of an active organo-halogen compound prior to deactivation of said catalyst.
• a Ziegler type catalyst comprising a nickel compound and an organo-aluminum compound as main components
• Lower ⁇ -olefins such as ethylene, propylene, butene-1 are useful as a starting material for producing high polymers which takes a basic position in the petrochemical industries. Besides, various studies have also been done on dimerization of these ⁇ -olefins in order to utilize them in fine chemical industries.
• 2-methylpentene can be converted into isoprene by a cracking reaction using a silica-alumina catalyst; 2,3-dimethylbutenes can be dehydrogenated to give 2,3-dimethylbutadiene which is useful as a material for synthetic rubbers and pyromellitic anhydride; and 2-methylpentenes and 2,3-dimethylbutenes can be converted into octane value improving agents by hydrogenation thereof.
• 2,3-dimethylbutene-2 as a material for producing agricultural chemicals.
• the following four processes for dimerizing olefins are known: (1) cationic isomerization using proton acids as a catalyst; (2) cationic isomerization using a combination of Lewis acid and co-catalyst; (3) anionic isomerization using an alkali metal or an alkali metal alcoholate as a catalyst; and (4) isomerization by addition of hydrides and removal thereof using a transition metal as a catalyst.
• the processes (1) and (2) have the following drawbacks: When it is tried to elevate the reactivity of isomerization, it results in occurence of side reactions such as formation of high polymers by an intermolecular reaction, and furthermore, the materials of equipments are undesirably corroded by the acids [cf. C. L. Thomas, Industrial and Engineering Chemistry, Vol. 41, page 2564 (1949)].
• the anionic isomerization process (3) is not economical, because it requires a comparatively expensive solvent for the reaction: specific aprotic polar solvents such as dimethylformamide, dimethyl sulfoxide, hexamethyl phosphoric triamide [cf. S. Bank, Journal of the Americal Chemical Society, Vol. 87, page 3245 (1965)].
• the process (4) is superior since it proceeds smoothly under mild conditions with little side reaction.
• the catalyst is a ⁇ -allyl type nickel complex as is disclosed in U.S. Pat. No. 3,644,558, it requires troublesome procedures for synthesis of the complex and further the complex is hardly handled since it decomposes in air.
• the present inventors have investigated these conventional processes in order to improve them so that after the dimerization of a lower ⁇ -olefin is finished, the isomerization can easily be done in the same reaction system. However, it was impossible to proceed smoothly the isomerization while remaining the dimerization catalyst without shortening of the life of isomerization catalysts by poisoning. These conventional processes may be used if the isomerization is carried out after the olefin dimers produced by the dimerization are isolated by rectification, but such a method is not economical since additional procedures are required.
• the present inventors have further intensively studied in order to find a process for isomerization of the dimers produced by dimerization of lower ⁇ -olefins in the same reaction system while remaining the dimerization catalyst, and have surprisinly found that the desired isomerization can very smoothly proceed when a specific active organo-halogen compound is added to the reaction system prior to deactivation of the dimerization catalyst.
• An object of the present invention is to provide an improved isomerization process of dimerized olefins.
• Another object of the invention is to provide a process for the isomerization of olefins following the dimerization thereof by adding a specific organo-halogen compound to the dimerization system after the dimerization.
• the present invention provides a process for isomerization of ⁇ -olefin dimers characterized by dimerizing a lower ⁇ -olefin in the presence of a Ziegler type catalyst comprising a nickel compound and an organo-aluminum compund as main components and then continuing the reaction with addition of at least one compound, prior to deactivation of said catalyst, which is selected from the group consisting of the following organo-halogen compounds of the formulae (I), (II), (III) and (IV), ##STR2## wherein X 1 , X 2 and X 3 are the same or different and are each a halogen or hydrogen atom or an alkyl group having 1 to 20 carbon atoms and at least one of them is a halogen atom, R is a hydrocarbon group having 1 to 20 carbon atoms and n is an integer of 0 to 5, ##STR3## wherein R 1 , R 2 and R 3 are the same or different and are each a hydrogen or halogen atom or a hydro
• R 4 is hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms
• X 7 , X 8 and X 9 are the same or different and are each a halogen or hydrogen atom or an alkyl group having 1 to 20 carbon atoms and at least one of them is a halogen atom
• X 10 and X 11 are the same or different and are each a halogen or hydrogen atom or an alkyl group having 1 to 20 carbon atoms and at least one of them is a halogen atom.
• alkyl group denotes a straight or branched alkyl having 1 to 20 carbon atoms (e.g. methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, amyl, isoamyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl, lauryl, stearyl) and a cyclic alkyl having 3 to 7 carbon atoms (e.g.
• hydrocarbon group denotes a straight or branched alkyl having 1 to 20 carbon atoms as mentioned above, a cyclic alkyl having 3 to 7 carbon atoms as mentioned above, an alkenyl having 2 to 20 carbon atoms (e.g. vinyl, allyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, dodecenyl), an aryl (e.g.
• cycloalkyl denotes a cyclic alkyl having 3 to 7 carbon atoms as mentioned above; and "halogen” denotes fluorine, chlorine, bromine or iodine.
• the following catalyst systems can be used: the catalyst system comprising nickel acetylacetonate and triethylaluminum as disclosed in U.S. Pat. No. 3,483,268; the catalyst system comprising nickel acetylacetonate, ethylaluminum sesquichloride and trialkyl phosphine as disclosed in U.S. Pat. No.
• the catalyst system comprising bis.trialkyl phosphine.nickel chloride complex and ethylaluminum sesquichloride as disclosed in U.S. Pat. No. 3,467,726; and the catalyst system comprising trihalonickelate complex and ethylaluminum sesquichloride as disclosed in U.S. Pat. No. 3,459,825. More preferably, there is used the catalyst system comprising a nickel compound, triethylaluminum, trialkyl phosphine and halogenated phenol as disclosed in co-pending U.S. Ser. No. 914,291 filed June 9, 1978; now U.S. Pat. No. 4,155,946.
• the process of the present invention is characterized in that isomerization is allowed to follow the aforesaid dimerization by adding the organo-halogen compound of the formulae (I) to (IV) to the reaction system after the dimerizaion is finished while the catalyst system for dimerization still keeps its activity.
• organo-halogen compound of the formulae (I) to (IV)
• the dimerization catalyst is deactivated, for example, by addition of large amounts of alcohol or water, the isomerization does not proceed.
• butene-1 which is an ethylene dimer
• butene-2 is of course possible
• 2-methylpentene-1 which is a propylene dimer
• 2-methylpentene-2 that of 4-methylpentene-1 into 4-methylpentene-2
• hexene-1 into hexene-2 and hexene-3 that of 2,3-dimethylbutene-1 into 2,3-dimethylbutene-2
• 2,3-dimethylbutene-1 into 2,3-dimethylbutene-2
• organo-halogen compounds used for the isomerization of the olefin dimer include various compounds as mentioned below.
• the compound of the formula (I) includes benzyl chloride, benzal chloride, benzotrichloride, p-methylbenzyl chloride, o-methylbenzyl chloride, p-nonylbenzyl chloride, o-nonylbenzyl chloride, p-methylbenzal chloride, o-methylbenzal chloride, p-nonylbenzal chloride, o-nonylbenzal chloride, p-methylbenzotrichloride, o-methylbenzotrichloride, p-nonylbenzotrichloride, o-nonylbenzotrichloride, 1-chloromethyl-2,4-dimethylbenzene, 1-chloromethyl-3,4-dimethylbenzene, p-chloromethylstyrene and their fluoro-, bromo- and iodo-homologues.
• the compound of the formula (II) includes allyl chloride, ⁇ -methallyl chloride, crotyl chloride, allyl- ⁇ , ⁇ -dichloride, 1,2,3-trichloropropene, 1-chloropentene-2, ⁇ -chloromethylstyrene and their fluoro-, bromo- and iodo-homologues.
• the compound of the formula (III) includes propargyl chloride, 1-chlorobutyne-2, 1-chloropentyne-2, 1-chloro-4-methylpentyne-2, ⁇ -chloromethylphenylacetylene and their fluoro-, bromo- and iodo-homologues.
• the compound of the formula (IV) includes tert-butyl chloride, sec-butyl chloride, isopropyl chloride, tert-amyl chloride, tert-heptyl chloride, cyclopropyl chloride, cyclobutyl chloride, cyclopentyl chloride, cyclohexyl chloride and their fluoro-, bromo- and iodo-homologues.
• the amount of the aforesaid organo-halogen compounds is not particularly limited, but usually, the organo-halogen compounds are used in an amount of 0.1 to 100 moles, preferably 0.5 to 50 moles, per 1 mole of the organo-aluminum compound in the catalyst system for the dimerization of ⁇ -olefins.
• the molar ratio of the organo-aluminum compound to nickel compound in the catalyst system used in the dimerization of ⁇ -olefins is not particularly limited, but is usually within the range of 2 to 500.
• the isomerization may be carried out in the presence or absence of a solvent, but usually, the inert solvent used in the foregoing dimerization (e.g. benzene, toluene, n-hexane, n-heptane, chlorobenzene) is used as it is in the isomerization. Since the starting lower ⁇ -olefins (e.g. ethylene or propylene) do not give any undesirable effect on the isomerization reaction, there is no problem even if the unreacted starting materials are remained.
• the inert solvent used in the foregoing dimerization e.g. benzene, toluene, n-hexane, n-heptane, chlorobenzene
• the starting lower ⁇ -olefins e.g. ethylene or propylene
• the isomerization may be carried out without removing the unreacted ⁇ -olefins from the dimerization system, or after removing predominantly the unreacted ⁇ -olefins from the dimerization system, i.e. after decreasing the inner pressure of reactor by purging the unreacted ⁇ -olefins.
• the isomerization can easily be carried out in either of continuous or batchwise form.
• the isomerization temperature can be selected within the wide range of about -50° C. to about 200° C., but a temperature between -20° C. and 120° C. is preferred in terms of control of side reactions.
• a time required for isomerization can optionally be selected depending upon a required isomerization percentage, and it is not particularly limited.
• the isomerization is carried out under an atmosphere of inert gas such as nitrogen or argon, and therefore, it should be avoided to proceed the isomerization with mixing a large amount of air or moisture. It is also preferable that the organo-halogen compound added in isomerization is previously deaerated and dehydrated.
• composition of ⁇ -olefin dimers was analyzed by gas-chromatography (sebaconitrile column: 6 m).
• the autoclave was immediately closed air-tightly. Dimerization was then carried out for 1.5 hours while maintaining the propylene pressure at 5 kg/cm 2 . After the dimerization was finished, a small amount of the reaction solution was sampled for analysis. After unreacted propylene was purged, 1.5 ml of toluene solution containing 1.5 mmole of benzyl chloride was added thereto. The autoclave was then closed air-tightly and isomerization was carried out at 20° C. for 1 hour. After the isomerization was finished, the reaction solution was treated in the same manner as in Example 1 to obtain 120 g of propylene dimer. The composition of the isomers was analyzed by gas-chlomatography. The results obtained are shown in Table 3.

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Citations (7)

• 1977
  • 1977-08-11 JP JP9667977A patent/JPS5430101A/ja active Granted
• 1978
  • 1978-07-28 US US05/928,978 patent/US4209653A/en not_active Expired - Lifetime
  • 1978-08-07 IT IT68868/78A patent/IT1203195B/it active
  • 1978-08-08 CH CH842278A patent/CH636834A5/de not_active IP Right Cessation
  • 1978-08-09 DK DK352478A patent/DK352478A/da not_active Application Discontinuation
  • 1978-08-09 HU HU78SU984A patent/HU180956B/hu not_active IP Right Cessation
  • 1978-08-10 FR FR7823626A patent/FR2399990A1/fr active Granted
  • 1978-08-10 SU SU782652603A patent/SU906361A3/ru active
  • 1978-08-10 GB GB7832972A patent/GB2003174B/en not_active Expired
  • 1978-08-10 BE BE78189810A patent/BE869652A/xx not_active IP Right Cessation
  • 1978-08-11 DE DE19782835365 patent/DE2835365A1/de active Granted
  • 1978-08-11 NL NL787808398A patent/NL7808398A/xx not_active Application Discontinuation

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